fix: MaterialColor Swatch Map comparison (#61974)

packages/flutter/lib/src/painting/colors.dart

@@ -450,7 +450,7 @@ class ColorSwatch<T> extends Color {
       return false;
     return super == other
         && other is ColorSwatch<T>
-        && other._swatch == _swatch;
+        && mapEquals<T, Color>(other._swatch, _swatch);
   }
 
   @override

packages/flutter/test/painting/colors_test.dart

@@ -7,6 +7,7 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/painting.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:flutter/material.dart';
 
 const double _doubleColorPrecision = 0.01;
 
@@ -440,4 +441,22 @@ void main() {
     final Map<String, Object> json = property.toJsonMap(const DiagnosticsSerializationDelegate());
     expect(json.containsKey('valueProperties'), isFalse);
   });
+
+  test('MaterialColor swatch comparison', () {
+    const Map<int, MaterialColor> sampleMap = <int, MaterialColor>{
+      0: Colors.lightBlue,
+      1: Colors.deepOrange,
+      2: Colors.blueGrey,
+    };
+    const MaterialColor first = MaterialColor(0, sampleMap);
+    const MaterialColor second = MaterialColor(0, sampleMap);
+    const MaterialColor third = MaterialColor(
+        0, <int, MaterialColor>{
+          0: Colors.lightBlue,
+          1: Colors.deepOrange,
+          2: Colors.blueGrey,
+        });
+    expect(first == second, true);
+    expect(first == third, true);
+  });
 }